Beeper is an auxiliary audio processing plugin which you can use to insert short beep, noise burst or silence signals to any sound material.

This plug-in may help you protect your work from theft. It is safe to apply this plug-in to any mission-critical material because plug-in does not perform any processing on the audio between signals. You may specify signal’s duration, beep frequency, signal’s loudness, period between signals and random variation of all parameters.

If you work with clients, you might wanna have this. When you send mp3s to show how the mix is going, there are people who might actually like the result and put out the mp3 as the "final" version so they don't have to finish to pay you. As crazy as it might sound, it actually happened to me. So now I put this plugin on the master bus and send the mp3 like that. Problem solved. Thanks Voxengo!